/**
 *    Copyright (C) 2025-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/db/commands/server_status/histogram_server_status_metric.h"

#include "mongo/unittest/unittest.h"

namespace mongo {
namespace {

// This test case is intended to serve as a cursory check of the HistogramServerStatusMetric
// initialization. It is not meant to be a comprehensive test of the Histogram class. For that,
// refer to histogram_test.cpp.
TEST(HistogramServerStatusMetricTest, TwoBuckets) {
    HistogramServerStatusMetric metric({5U});
    metric.increment(3U);
    metric.increment(7U);
    metric.increment(8U);

    auto&& histogram = metric.hist();
    auto iter = histogram.begin();
    {
        ASSERT(iter != histogram.end());
        auto&& bucket = *iter;
        ASSERT_EQ(bucket.count, 1);
        ASSERT(!bucket.lower);
        ASSERT_EQ(*bucket.upper, 5U);
    }

    iter++;
    {
        ASSERT(iter != histogram.end());
        auto&& bucket = *iter;
        ASSERT_EQ(bucket.count, 2);
        ASSERT_EQ(*bucket.lower, 5U);
        ASSERT(!bucket.upper);
    }

    iter++;
    ASSERT(iter == histogram.end());
}

}  // namespace
}  // namespace mongo
